The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 13, 2005
Filed:
Oct. 31, 2000
M. Ali Khatibzadeh, Morrisville, NC (US);
Aristotle Hadjichristos, Apex, NC (US);
Scott R. Justice, Durham, NC (US);
Steven G. Cairns, Louisburg, NC (US);
Charles Gore, Jr., McKinney, TX (US);
Jeffrey Schlang, Dallas, TX (US);
Erik Bengtsson, Cary, NC (US);
William O. Camp, Jr., Chapel Hill, NC (US);
David R. Pehlke, Chapel Hill, NC (US);
M. Ali Khatibzadeh, Morrisville, NC (US);
Aristotle Hadjichristos, Apex, NC (US);
Scott R. Justice, Durham, NC (US);
Steven G. Cairns, Louisburg, NC (US);
Charles Gore, Jr., McKinney, TX (US);
Jeffrey Schlang, Dallas, TX (US);
Erik Bengtsson, Cary, NC (US);
William O. Camp, Jr., Chapel Hill, NC (US);
David R. Pehlke, Chapel Hill, NC (US);
Abstract
A digital signal processor generates in-phase, quadrature-phase and amplitude signals from a baseband signal. A modulator modulates the in-phase and quadrature-phase signals to produce a modulated signal. A phase locked loop is responsive to the modulated signal. The phase locked loop includes a controlled oscillator having a controlled oscillator input. An amplifier includes a signal input, amplitude control input and an output. The signal input is responsive to the controlled oscillator output and the amplitude control input is responsive to the amplitude signal. The in-phase and quadrature-phase signals may be normalized in-phase and quadrature-phase signals. Alternatively, a phase tracking subsystem may be provided that is responsive to the quadrature modulator to produce a phase signal that is responsive to phase changes in the modulated signal and that is independent of amplitude changes in the modulated signal. An amplitude tracking subsystem also may be provided that is responsive to the modulator to produce an amplitude system that is responsive to amplitude changes in the modulated signal and that is independent of the phase changes in the modulated signal. An amplifier has a signal output, an amplitude control input and an output. The signal input is responsive to the phase signal and the amplitude control input is responsive to the amplitude signal.